Unapproved N rated tyres for a model?

[NBTBRV8]

Looking specifically at the GT3, the only tyres Porsche recommend are the Dunlop Sport Maxx Race and MPSC2. Has any dealer knocked back the warranty extension when another type of N rated tyre has been fitted, such as the P Zero or the PS4S, i.e. those fitted to the Turbo?

https://files.porsche.com/filestore/download/uk/no...